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  <h1 class="title">简介</h1>
  <p class="para">
   The OGG/Vorbis file format, as defined by <a href="http://www.vorbis.com/" class="link external">&raquo;&nbsp;http://www.vorbis.com/</a>, is a scheme
   for compressing audio streams by multiple factors with a minimum of
   quality loss. This extension adds Ogg Vorbis support to PHP&#039;s
   <a href="wrappers.html" class="link">URL Wrappers</a>. When used in read mode,
   compressed OGG/Vorbis data is expanded to raw PCM audio in one of six PCM
   encoding formats listed below.
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